XXXVlll FOURTH REPORT 1834. 



3. That Dr. Greene and Dr. Hooker be requested to prepare a 

 Report on the state of our knowledge of the Botany of North 

 America. 



4. That the Zoological Queries introduced in last year's Re- 

 commendations be continued, except the 6th and 7th. 



5. That the Botanical Inquiries be continued. 



6. As a full and arranged Catalogue of the works on Natural 

 History (including Memoirs, &c., in Journals and Transactions,) 

 would greatly facilitate the study of that branch of science, it is 

 recommended that at the next meeting of the Association a 

 Committee be appointed for devising the means of forming and 

 publishing such a catalogue ; and that in the mean time, to aid 

 the labours of that Committee, gentlemen who have devoted 

 themselves to the study of particular departments of natural 

 history be earnestly requested to send in to the Assistant-Secre- 

 tary lists of the works, memoirs, &c., relating to such depart- 

 ments. 



Medical Committee. 



The Medical Committee reported that the sum of 25/. was 

 placed at the disposal of Dr. Marshall Hall and Mr. Broughton 

 for the investigation of the subject of the Sensibilities of the 

 Nerves of the Brain ; that these gentlemen have presented a 

 report, which has been read and highly approved ; that their 

 experiments are not yet complete, but they do not ask for any 

 further grant for the prosecution of them. {Report received.) 



They further reported that a sum of 25/. was placed at the 

 disposal of Dr. Roupell and Dr. Hodgkin for prosecuting an in- 

 quiry into the effects of poisons on the animal oeconomy ; that 

 an interim report has been read from these gentlemen who are 

 prosecuting the inquiry, and that they do not at present ask for 

 any further grant. 



The Committee recommended, as an important object of in- 

 quiry, the anatomical relations of the absorbent and venous sy- 

 stems in the different classes of animals, to be illustrated by in- 

 jected preparations and gr.iphic representations. 



The Committee, considering the contradictory results ob- 

 tained by the distinguished anatomists who have prosecuted this 

 subject of investigation, recommended that two Sub-Committees 

 be appointed for prosecuting the inquiry, the one to sit at Edin- 

 burgh and the other in London. 



The Edinburgh Sub-Committee to consist of Dr. Allen Thomp- 

 son, Dr. Alison, Dr. Fletcher, Dr. Sharpus, Dr. Hardyside, Dr. 

 Reid, Mr. Mackenzie and Mr. Dick ; and the London Sub-Com- 

 mittee to consist of Dr. Hodgkin, Dr. Roget, Dr. Clark of Cam- 

 bridge, Mr. Bracey Clark, Mr. Clift and Mr. Broughton, with 



