334 



INSECT ARCHITECTURE. 



of the rose, with this difference, that instead of the indivi- 

 dual cells being diffused irregularly through the mass, they 

 were all arranged at the off-goings of the leaf-stalks, each 

 cell being surrounded with a covering of the vegetable 

 wool, which the stimulus of the parent egg, or its gluten, 



Woolly Gall ol the Oak, less than the natural size, caused by a Cynips, and drawn from 

 a specimen. 



had caused to grow, and from each cell a perfect fly had 

 issued. We also remarked that there were several small 

 groups of individual cells, each of which groups was con- 

 tained in a species of calyx or cup of leaf-scales, as occurs 

 also in the well-known gall called the oak-apple. 



We were anxious to watch the proceedings of these flies 

 in the deposition of their eggs, and the subsequent develop- 

 ments of the gall-growths ; and endeavoured for that purpose 

 to procure a small oak plant in a garden-pot ; but we did 

 not succeed in this : and though they alighted on rose and 

 sweet-briar trees, which we placed in their way, we never 

 obsei*ved that they deposited any eggs upon them. -In 

 a week or two the whole brood died, or disappeared. 

 (J. R.) 



There are some galls, formed on low-growing plants, 



