THE YOUNG NATURALIST. 



31 



having only 94 butterflies, while Silesia has 124. To account for this he 

 quotes meteorological statistics, from which he educes two facts, viz. : — ■ 



"1. That the West of England has a moister atmosphere and greater 

 rainfall than the East. 



2. That the day temperature in summer increases rapidly from N.W. 

 toS.E." 



He then contends that having shown that the number of butterflies in- 

 creases rapidly as we go from N.W. to S.E., he is justified in considering 

 there is a direct connection between the two sets of facts. 



Mr. Walker also shows that the discrepancy between East and West is still 

 greater if tree feeders only are considered, and argues that "insufficient 

 ripening of the wood of trees and shrubs from want of solar heat would pro- 

 duce a condition in the leaves injurious to the health of the larvae. 



The paper concludes with a very brief reference to Nocturnal Lepidoptera, 

 which appear to be affected by the same causes, but not to the same extent. 



"The Journal of Microscopy and Natural Science." 

 Part 17, January, 1886. 



From our particular standpoint the part for the current month is the best 

 yet issued of this periodical. The article that attracts our special attention 

 is the one on ft The Mouth Organs and other characteristics of the British 

 Geodephaga," by Eobert Gillo ; but there are several others of almost equal 

 interest to us, altogether apart from Microscopy. In fact, the part might be 

 called an Entomological number. We could not give a condensation of Mr. 

 GihVs valuable paper, but recommend it our readers. It is illustrated with 

 three plates of beetles and details of their mouths and feet. A letter from 

 Maori-land, and a paper on Fresh Water Algse are both of considerable in- 

 terest. No one will begrudge the eighteenpence if they order this part. 



We observe the promised " Scientific Enquirer/ 7 a new journal, also under 

 Mr. Allen's editorship, is now promised for 1st February. 



NOTES AND OBSERVATIONS. 



Note on Entomological Advertising. — In October, 18b 5, I sent a 

 notice to the Entomologist, that I should be tc At Home to Artists and 

 Entomologists on every Sunday from November, 1885, to March, 1886, and 

 received a note to say I must remit three shillings and sixpence for it as an 

 advertisement, before it could be inserted in that serial. " Three and Six- 

 pence " to let my friends and the public know that I was willing to give up 

 my time gratuitously in the interest of science ! It struck me, perhaps, the 



