188 CARNEGIE INSTITUTION OF WASHINGTON. 



Short-cared owl = Asio flammcus. Boat-tailed grackle = Megaquiscalus major 

 Yellow-billed cuckoo = Coccyzus americanus major. 



ainerieanas. Florida cardinal = Cardinalis cardmalis 

 Belted kingfisher = Ceryle alcyon. floridanus. 



Red-bellied woodpecker = Centurus euro- Summer tanager = Piranga rubra rubra. 



linus. Purple martin = Progne subis subis. 



Chuck-will's widow = Antrostomua caro- Bam swallow = Hirundo erythrogastra. 



linensis. Loggerhead shrike = Lanius ludovicianus 

 Night hawk = Chordeiles virginianus vir- ludovicianu.s. 



ginianus. Key West vireo = Vireo griseus maynardi. 



Night hawk (subspecies?) = Chordeiles vir- Parula warbler = Compsothlypia americana 



ginianus ? americana. 



Ciray kingbird = Tyrannus dominicensis. Yellow palm warbler = Dendroica palma- 



Wood pewee = Myiochanes viren.s. rum hypochrysea. 



Florida blue jay = Cyanocitta cristata flor- Florida yellow-throat = Geothlypis trichas 



incola. ignota. 



Florida crow = Coi-vus brachyrhynchos pas- Redstart = Setophaga ruticilla. 



cuus. Mocking-bird = Mimus polyglottos poly- 

 Bobolink = Dolichonyx oryzivorus. glottos. 

 Bahama red-winged blackbird = Agelaius 



phocniceus bryanti. 



Report on Botanical Investigation at Tortugas Laboratory, Season 1916, 

 by H. H. M. Bowman. 



In this second season of the author's investigation at the Tortugas Labora- 

 tory some of the same series of experiments on the physiology of mangroves 

 has been carried on as in the season of 1915, but in a more extended manner. 

 Part of the season was also utihzed in making experiments on the mangroves 

 of a chemico-physiologic nature. 



The first half of this season was consumed in making a large number of 

 tests of Rhizophora seedlings to learn if possible the relation between the 

 tannic-acid content of the hypocotyl and the dextrose content of this organ 

 in the plant's economy. With this end in view, seedlings were carefully 

 selected from material growing on the beaches at Bush Key and Loggerhead 

 Key, and graded according to length of hypocotyl, length of leaves, etc. 

 Equal weights of these hypocotyls constituted the material tested, the 

 differences in size in the plants being generally interpreted as differences in 

 age, but all the seedlings were apparently dropped from the parent trees in 

 February or March of the same year. This uncertainty of age was rather 

 disturbing to the investigator, since it can not be known through what 

 vicissitudes the seedlings may have gone during the intei-val in which they 

 were floating in the sea— that is, from the time the hypocotyl was dropped 

 till it became anchored and the roots put out. This point seems to be of 

 considerable importance, since some hypocotyls are broken and often seri- 

 ously injured in their journey of perhaps several weeks on the sea, until 

 they come to an anchorage. Some seedlings with the plumule broken off 

 \vill later send out several buds from the lenticels farther down on the neck 

 of the hypocotyl, but this decreases the reserve food in the organ, and in 

 the tests made this season all such seedhngs were rejected. It is the author's 

 hope to spend a longer time on this problem and test only seedlings which 

 have been plucked from the trees just before they would have fallen naturally. 

 They will then be planted in moist sand, so that the age of all plants will be 

 definitely known, and the plants kept under controlled conditions; however, 

 this can only be realized in a pennanent tropical laboratory. 



