Alternating generations; a biological study of oak galls and gall flies . Pla-te ni. OaM-Jcli. Jlic. Tr.v/=*.-, hth. The Method of Ovipositing, 115 quite evident that the anterior plate remains always afixed point, while on the contrary the posterior plateis drawn alternately up and down. By these simplemovements of the posterior plate, the insertion andwithdrawal of the spiculae are carried on ; the thrustingout of the spiculae is the harder operation, and iseffected by two powerful muscles; while their with-drawal is easier, and requires only one muscle. Theanterior plate remains passive dur

Alternating generations; a biological study of oak galls and gall flies . Pla-te ni. OaM-Jcli. Jlic. Tr.v/=*.-, hth. The Method of Ovipositing, 115 quite evident that the anterior plate remains always afixed point, while on the contrary the posterior plateis drawn alternately up and down. By these simplemovements of the posterior plate, the insertion andwithdrawal of the spiculae are carried on ; the thrustingout of the spiculae is the harder operation, and iseffected by two powerful muscles; while their with-drawal is easier, and requires only one muscle. Theanterior plate remains passive dur Stock Photo
Preview

Image details

Contributor:

The Reading Room / Alamy Stock Photo

Image ID:

2AN1TWM

File size:

7.1 MB (306.3 KB Compressed download)

Releases:

Model - no | Property - noDo I need a release?

Dimensions:

1267 x 1972 px | 21.5 x 33.4 cm | 8.4 x 13.1 inches | 150dpi

More information:

This image is a public domain image, which means either that copyright has expired in the image or the copyright holder has waived their copyright. Alamy charges you a fee for access to the high resolution copy of the image.

This image could have imperfections as it’s either historical or reportage.

Alternating generations; a biological study of oak galls and gall flies . Pla-te ni. OaM-Jcli. Jlic. Tr.v/=*.-, hth. The Method of Ovipositing, 115 quite evident that the anterior plate remains always afixed point, while on the contrary the posterior plateis drawn alternately up and down. By these simplemovements of the posterior plate, the insertion andwithdrawal of the spiculae are carried on ; the thrustingout of the spiculae is the harder operation, and iseffected by two powerful muscles; while their with-drawal is easier, and requires only one muscle. Theanterior plate remains passive during the act of ovi-positing, therefore the seta, which is firmly unitedto it, takes a less active part; it is pushed steadilyforward by the fly and is driven into the canal that hasbeen bored and opened by the spiculae. We must next inquire into the manner in which thegall-fly introduces the egg into the bud by means ofthis apparatus. Hartigs explanation, which has hithertobeen received, was that the extremely ductile egg wasdriven through the ovipositor itself. He thoughtthat th

Save up to 70% with our image packs

Pre-pay for multiple images and download on demand.

View discounts