(414) 
eliminated by exchanging them for plants from other insti- 
tutions. The main grouping remains as described in the 
third edition of the descriptive guide to the grounds, 
buildings and collections.* 
Some of the palms in the large central house are growing 
so tall as to endanger the roof and at least one of them will 
soon have to be removed. In order to grow certain palms 
to their full height, it would be necessary to have a green- 
house at least 20 feet higher. 
18. Conservatory Range 2 
The grouping of the collections in this greenhouse has 
remained essentially unchanged, modifications being 
brought about only by additions and elimination of dupli- 
cates. The forced temporary moving of the collections 
from this greenhouse to conservatory range I, owing to 
fuel conditions, described elsewhere in this report, may be 
taken advantage of next spring and summer to effect what 
appears to be a desirable regrouping of the greenhouse 
collections, taken in connection with the two additional 
greenhouses given for range 2 by Messrs. Daniel and Murry 
Guggenheim, now under construction. These two addi- 
tional greenhouses will permit a much better display of all 
the collections under glass by relieving the present crowding 
of the plants 
19. Propagating and Experimental Greenhouses 
Work in plant breeding has been continued, in charge 
of the Director of the Laboratories and students, and 
instruction in greenhouse gardening has been given by the 
Supervisor of Gardening Instruction. Reference is made 
to the reports of these two officials hereto appended. Con- 
siderable propagating work has been accomplished, many 
plants having been grown from seeds received from warm 
regions and others by cuttings. One of the houses of this 
range has been occupied by a part of the great collection 
* See Bull. N. Y. Bot. Gard. No. 34, September, 1916. 
