Philosophical Transactions for 1825. 541 



" The Crooniaa Lecture, On the existence of Nerves in the Pla- 

 centa;" has been analysed at page 581 of our first volume: the 

 second, entitled " Observations on the changes the Ovum of the 

 Frog undergoes during the formation of the Tadpole," at page 

 582 of the same volume : the third, " Observations on the In- 

 fluence of the Nerves and Ganglions in producing Animal Heat," 

 was regarded as too purely physiological to require extensive notice : 

 the leading facts of the fourth, " Microscopical Observations on 

 the materials of the Brain, and of the Ova of Animals, to show 

 the Analogy that exists betvt'een them," being given at page 277 

 of our present volume. The very interesting paper by Dr. J. R. 

 Johnson, entitled " Further Observations on the genus Planariay" 

 has been in like manner analysed at page 132 of our present 

 volume ; as has also ** An Essay on Egyptian Mummies ; with 

 Observations on the art of embalming among the ancient Egyptians, 

 by Dr. Granville," at page 272. The leading facts of a" Notice 

 of the Iguanodon^ a Fossil Herbivorous Reptile, found in the 

 sandstone of Tilgate Forest ; by Gideon Manti'll, Esq.," will be 

 found at page 130 ; and those of the paper " On the fossil Elk of 

 Ireland ; by T. Weaver, Esq." at page 275 of our present volume. 

 The exception alluded to at the commencement of our notice 

 is in favour of the paper " On the Anatomy of the Mole-Cricket ; 

 by Dr. Kidd ;" the contents of which, referring as they do to the 

 detailed and minute examination of an insect, obviously could not 

 be sufficiently understood unless on the most attentive perusal. 

 Even now, wJth the paper itself, and with the figures by which it 

 is illustrated, before us, we find it impossible to convey an ade- 

 quate idea of it without following the author at greater length 

 than our limits will permit. We must, therefore, refer to the 

 article itself such of our readers as may be desirous of particular 

 information, relative to th^anatomy of the Gryllotalpa vulgaris^ 

 which forms an interesting supplement to the labours of M. Marcel 

 de Serres, and of Sir E. Home, and to the very extensive and 

 admirable series of anatomical details of the ColeopierOy for which 

 we are indebted to M. Audouin, and which are still continued, 

 with unabated zeal and ability, in the Annales des Sciences 

 Naturelles. 



