306 REPORT OF SCIENTIFIC MEETINGS. 



perfect insect is fond of resting in the day-time amongst the leaves of the 

 ash, from which tree almost all my specimens were beaten. The rest were 

 taken at sugar. (C.) 



105. X. gilvago. — I did not meet with this species while residing in Suffolk, 

 but during a recent visit at my friend's, the Rev. H. Bree, of Woolverstone, 

 I dug up one pupa. 



N.B.— This insect is by no means uncommon in the midland counties. I 

 have taken it rather freely in years past in Derbyshire at sugar. (C.) 



106. AT. ferruginea. — Larvse in great profusion on 'the wych elm, as noted 

 above. I gave a description of it, (Int. June 20th., 1857,) supposing it to be 

 Gilvago. The description given by Treitschhe (Manual, p. 253,) is very inac- 

 curate, and might do for anything. I do not know how it may be on the 

 continent, but I am very sure that in this country the larva does not feed 

 on the seeds of the poplar, but on those of the wych elm. 



N.B. — I am myself inclined to think that the eggs of this insect do not 

 hatch till the spring, and that if the larva? hatch before the buds burst, they 

 feed upon the bark of the twigs, which is rendered quite soft and tender by 

 the rising sap. I have not unfrequently seen larvse in the early spring feeding 

 on the young bark of various trees and shrubs. The larva of this insect, like 

 that of A. pistacina, does not assume the pupa state for some weeks after it 

 has spun up. It feeds freely upon the seeds, and if they are scarce, upon 

 the leaves of the wych elm. (C.) 



REPORT OF SCIENTIFIC MEETINGS. 



ACADEMY OF SCIENCES, PARIS. 



From the "Revue de Zoologie" for Septemher. 



Sitting, September 6th., 1858. 



M. C. Barnard read a memoir on the quantity of oxygen contained in the 

 venous blood of glandular organs during functional action and during repose, 

 and on the employment of oxide of carbon for determining the proportions 

 of oxygen in the blood. 



M. Le Baun Seguir detailed the result of his experiments by means of the 

 apparatus for artificial incubation. This apparatus consists of a central 

 stove, (poete,) surrounded by a number of nests, each covered by a caoutchouc 

 bag, connected with the stove by two tubes of the same material. The water 

 is warmed in the stove by charcoal, the combustion being regulated by the 

 "pyrostat sorel;" the liquid circulates incessantly from the stove to the nest 

 and back again, to take up the little quantity of heat dispersed in the incu- 

 bation. The circular movement continues as long as there is any charcoal in 

 the apparatus. The capacity of the charcoal receiver has been so calculated 



