PROCEEDINGS OF THE COTTESWOLD CLUB 57 



contractions per minute of the abdominal segments when 

 aroused or excited, and about half that number when at 

 rest. In the account of Mr Newport's experiments as 

 communicated to Royal Society by Dr. Roget (1836) we 

 find his method was as follows :— First the bulk of the 

 insect was ascertained. It was then confined in a 

 stoppered bottle of known capacity, and the hour and the 

 degree of temperature were noted. After some time the 

 bottle was put invertedly into a vessel containing lime 

 water, and the stopper withdrawn. It remained thus for 

 half-an-hour. The contraction in the enclosed air (allow- 

 ance being made for any change of temperature and 

 pressure) indicated the amount of carbonic acid formed, 

 and therefore the quantity of respiration. 



The following tables as the resuks of some of a number 

 of ex])eriments are given. 



Si)hinx Ligustri - 



Papilio or \'anessa 

 Lirticfe 



DURATION OF 

 State Experiment, 



l.arva 

 Pupa 



Pupa 

 Imago 



Bombus terrestris Imago 



5 hours 



147 



12 

 48 

 i6i 



During hibernation, the temperature being from 20^ — 

 37°, the respiration of certain pupae experimented upon 

 was almost suspended, but yet distinct evidence of its being 

 carried on in some degree was obtained ; and vitality 

 continued in spite of the low temperature and all the 

 pupa^ became imagos. The relation of the organs of 

 respiration to the volume of structure is this : In larva; 



