98 MORPHOLOGY, ETC., OF THE MICHOPTERYGIDjE, 1., 



express ray profound gratitude and thanks to him, and trust 

 that the results which lie has made possible, by his unselfish and 

 painstaking supplying of the requisite material, may be in them- 

 selves the best acknowledgment of my deep debt to him. In 

 saying this, I have in mind especially the fact that he knew, 

 from my first letter, how disinclined I was to accept his removal 

 of the genus Micropteryx from its (as I hold) nearly related 

 genera to a new Order; yet, knowing this, he has not spared 

 himself, at his age, in obtaining for me all the rare material 

 which he, and nobody else in the world, is able to secure, as the 

 result of many years untiring study of this group. One would 

 have to search far indeed for a finer example of the true scientific 

 spirit, in which one's own conclusions, however dear they may 

 be on account of the work and sacrifices which gave them birth, 

 are nevertheless not considered at all, when there is a possibility 

 of supplying another scientist, holding perhaps opposite views, 

 with the material for carrying out his researches. 



That I have not overstated the case it is now my pleasure to 

 prove, by an enumeration of the various consignments of material 

 which I have already received from Dr. Chapman. The first 

 consignment was sent off in January of this year (1918); the 

 last was received last month (Nov , 1918), and more are pro- 

 mised. Of more than a dozen consignments altogether, only one 

 (the second) has been lost by the action of submarines. The 

 following is a list of the material so far received, on which this 

 paper is chiefly written : — 



(1) Dried cocoons and pupa? of Eriocrania semipurpurella 

 Steph. 



(2) Slides of the exoskeleton of the last larval instar of Erio- 

 crania semipurpurella. 



(3) A slide of the exoskeleton of the first larval instar of 

 Micropteryx calthella Linn. 



(The lost consignment contained further material of the above). 



(4) Two consignments of well-grown larva? of Eriocrania 

 seniijnirptirella, in spirit. 



(5) Three consignments of first instar larva? of Micropteryx 

 calthella, fixed in Carls' Fixative, as requested by me. 



