Royal Physical Society. 45 



to their full length ; they also come out of little cases of about 

 a quarter of an inch long, and in the course of a few minutes 

 attain their full growth of about two and a half inches long. 

 The whole process does not take more than ten minutes. The 

 animal now in its perfect form is at first very soft and tender, 

 but in the course of half an hour's exposure to the atmosphere, 

 he hardens and becomes strong and ready for flight." One 

 would say that this description had been written for the leaf- 

 insect, — so exactly does it represent the process in it. 



After each of the first two moultings, the insect assumed a 

 beautiful emerald-green colour ; while after the last moult, the 

 body had a slight tinge of yellow round it. It subsequently 

 gradually became yellower and brownish at the edge, passing 

 through the different hues of a decaying leaf. Like the leaf it 

 resembles and feeds upon, it seemed to decay on arriving at ma- 

 turity ; and it is to be observed that its sere and yellow leaf 

 also occurred at the period of the year when the foliage assumes 

 its autumnal tint, viz., in the end of September and beginning 

 of October. How far the causes which bring about this result 

 resemble each other in plants and animals, will be an interest- 

 ing subject of inquiry to the physiologist, when we have a 

 better supply of the insect to experiment upon. 



III. On a Remarkable Pouched Condition of the Glandular Peyeriance of 

 the Giraffe. By T. Spencer Cobbold, M.D., Assistant Conservator of 

 the Anatomical Museum, University of Edinburgh. (Plate V.) 



Among the various modes of extension of the intestinal 

 mucous element in vertebrate animals, we have several in- 

 stances where the general absorbing surface is increased by 

 the development of sacculi or pouches ; but, so far as we are 

 aware, no example has hitherto been placed on record of a 

 similar kind of membranous reduplication specially involving 

 Peyer's patches. 



At a meeting of the Physical Society, held April 5, 1854, we 

 offered a somewhat detailed account of the anatomical and pa- 

 thological data furnished by the post-mortem examination of a 

 Giraffe, and the facts then enunciated (except as regards the 



