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. Contributions from the Laboratory of Plant Genetics. :; i THE POPULAR SCIENCE MONTHLY In closing I should like to call attention to a fact both of evolu- tionary and of commercial importance. The first generation of crosses between nearly related types generally grows more vigorously than the pure types themselves. If the fertility is not impaired, they even fruit more freely. This is undoubtedly the explanation of Burbank's quick- growing hybrid walnuts, but if they were self-pollinated and grown for another generation a large percentage of the progeny would lose this character. In naturall Stock Photo
RMRE9T1D–. Contributions from the Laboratory of Plant Genetics. :; i THE POPULAR SCIENCE MONTHLY In closing I should like to call attention to a fact both of evolu- tionary and of commercial importance. The first generation of crosses between nearly related types generally grows more vigorously than the pure types themselves. If the fertility is not impaired, they even fruit more freely. This is undoubtedly the explanation of Burbank's quick- growing hybrid walnuts, but if they were self-pollinated and grown for another generation a large percentage of the progeny would lose this character. In naturall
. The bird, its form and function. Birds. Tails 421 the classic form of a lyre; while twelve of the central feathers, so scantily barbed that their stems are plainly visible, hold positions corresponding to the strings of that ancient instrument. The two elongated middle feathers cross each other and curve outward, adding still more to the decorative effect of this strangely beautiful member. Naturall}' we find that these birds are better runners than fliers. The females lack the or- namental tail. If we judge from analogy with the human race, when an inordinate amount of ostenta- tious show i Stock Photo
RMRE4N93–. The bird, its form and function. Birds. Tails 421 the classic form of a lyre; while twelve of the central feathers, so scantily barbed that their stems are plainly visible, hold positions corresponding to the strings of that ancient instrument. The two elongated middle feathers cross each other and curve outward, adding still more to the decorative effect of this strangely beautiful member. Naturall}' we find that these birds are better runners than fliers. The females lack the or- namental tail. If we judge from analogy with the human race, when an inordinate amount of ostenta- tious show i
. Camera studies of wild birds in their homes . Birds; Photography of birds. 11 plant lice. How she could retain her grip upon them and still "dee-dee" so vigorouslj' was a nij^stery, but the sound poured forth as rapidly from between her closed mandibles as it did later after she had deposited the food where it belonged. Naturall v, with a mother bird anxious to feed her babies, to help us, it required but a few minutes to locate the nest in a small dead tree beside the wall, ^^iolent as had been her protestations when we first found her, she soon became quite reconciled to our pres Stock Photo
RMRDDYRN–. Camera studies of wild birds in their homes . Birds; Photography of birds. 11 plant lice. How she could retain her grip upon them and still "dee-dee" so vigorouslj' was a nij^stery, but the sound poured forth as rapidly from between her closed mandibles as it did later after she had deposited the food where it belonged. Naturall v, with a mother bird anxious to feed her babies, to help us, it required but a few minutes to locate the nest in a small dead tree beside the wall, ^^iolent as had been her protestations when we first found her, she soon became quite reconciled to our pres
. Commercial poultry raising;. Poultry. 566 COMMERCIAL POULTRY RAISING to determine by casual observation, and when one considers the delay and loss likely to occur from unmated birds, or from stock so old as to be past their period of prolificacy, it becomes apparent that much depends upon the word of the seller. Unmated birds will cause a lot of trouble in a loft. Unlike poultry, pigeons are monogamous; they mate in pairs, and usually remain devoted for life. Obviously, the experienced breeder sees to it that his birds are properly mated, either. Fig. 339.—White runt, female pigeon. naturall Stock Photo
RMREF0TM–. Commercial poultry raising;. Poultry. 566 COMMERCIAL POULTRY RAISING to determine by casual observation, and when one considers the delay and loss likely to occur from unmated birds, or from stock so old as to be past their period of prolificacy, it becomes apparent that much depends upon the word of the seller. Unmated birds will cause a lot of trouble in a loft. Unlike poultry, pigeons are monogamous; they mate in pairs, and usually remain devoted for life. Obviously, the experienced breeder sees to it that his birds are properly mated, either. Fig. 339.—White runt, female pigeon. naturall
. The book of butter : a text on the nature, manufacture and marketing of the product . Butter. CARE OF MILK AND CREAM 39 conditions it is possible to produce milk with a germ- content of less than ] 0,000 bacteria, to a cubic centimeter. Fig. '1 —All old b irn with rriiks filled with straw is not a sanitary pUire 111 which to milk. when the utensils are properly prepared. For data and proper methods of cleaning dairy utensils, see Chapter III. A METHOD OF PREVENTING THE GROWTH OF BACTERIA A question that naturall}' follows the above discussion is : What factors are important in the growth of Stock Photo
RMRDXR4A–. The book of butter : a text on the nature, manufacture and marketing of the product . Butter. CARE OF MILK AND CREAM 39 conditions it is possible to produce milk with a germ- content of less than ] 0,000 bacteria, to a cubic centimeter. Fig. '1 —All old b irn with rriiks filled with straw is not a sanitary pUire 111 which to milk. when the utensils are properly prepared. For data and proper methods of cleaning dairy utensils, see Chapter III. A METHOD OF PREVENTING THE GROWTH OF BACTERIA A question that naturall}' follows the above discussion is : What factors are important in the growth of
. The illustrated natural history [microform]. Mammals; Natural history; Mammifères; Sciences naturelles. J^ ''% 1 i' I, ^^^;:i i li:. 606 THE SLEPEZ MOLE RAT. Tlie Marmot is a clumsy looking animal, and is not very active. Its movements are rather s ou-, and devoid of that hriUiant activity v'hich distin<,n.i.sho.s the Leopard Marmot Althouf,']. It .,s ca.sily tamed when taken y..un- it hardly repavs the trouble of it.s owner as It IS a very uniutellectual creature, and is ever too ready to use its powerful teeth upon' the iiand of any ono who may attempt to handl.- or caress it. Naturall Stock Photo
RMREPPHX–. The illustrated natural history [microform]. Mammals; Natural history; Mammifères; Sciences naturelles. J^ ''% 1 i' I, ^^^;:i i li:. 606 THE SLEPEZ MOLE RAT. Tlie Marmot is a clumsy looking animal, and is not very active. Its movements are rather s ou-, and devoid of that hriUiant activity v'hich distin<,n.i.sho.s the Leopard Marmot Althouf,']. It .,s ca.sily tamed when taken y..un- it hardly repavs the trouble of it.s owner as It IS a very uniutellectual creature, and is ever too ready to use its powerful teeth upon' the iiand of any ono who may attempt to handl.- or caress it. Naturall
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