manner that on the 6th AjDril the greatest number of species 

 were observed at sallow, the minimum temperature being 

 45° F., or 6° F. above the mean, the weather overcast and 

 quiet, the humidity 70 per cent., and the moon, in the first 

 quarter, setting early. 



(3) The comparison of diagrams corresponding to different 

 years should also facilitate the study of the effect of weather 

 on the appearance of species, having regard to their occur- 

 rence during the winter in the egg, larva, pupa or perfect 

 state. 



(4) Apart from the effect of the weather on time of appear- 

 ance, there is room for further investigation as to its effects, 

 direct and indirect, on the abundance or scarcity of a species. 

 When one considers the very great differences between the 

 simultaneous states of different species, that, as regards 

 weather, one insect's meat is another's poison, and that any 

 one species may have encountered favourable conditions 

 during one stage but unfavourable during another, it seems 

 clear that the subject is so complex that it can only be 

 analysed and the results expounded by the comparison of 

 systematic records. 



(5) Another interesting line of investigation suggested by 

 such diagrams is the effect which a sudden setting in of un- 

 favourable weather, in the middle of the period of emergence, 

 will have on the propagation of a species, having regard to 

 the fact that the males usually emerge a few days before the 

 females. 



(6) There are still some problems to be solved bearing on 

 immigration. Here, again, simultaneous records in different 

 localities might throw further light on this subject by indi- 

 cating the weather conditions, the points of arrival, and the 

 general directions in which the immigrants spread themselves 

 over the country. 



A copy of the Diagram can be seen at the Society's Library. 



Birds and Butterflies. — Dr. G. D. H. Carpenter said 

 that since many naturalists believe that birds do not eat 

 butterflies no case of such an occurrence should be left un- 

 recorded ; on Feb. 1.5th of this year about mid-day he saw a 

 male Brimstone Butterfly fly through the garden at Oxford. 



