CONTENTS. 



MEMOIRS. 



Page. 



1. The absolute value of the acceleration of gravity determined by the ring-pendulum method, by Charles E. 



Mendenhali 1 



2. Clayton hi Gronov. A morphological and anatomical study, by Theodore Holm 25 



3. A research upon the action of alcohol upon the circulation, by Horatio C. Wood and Daniel M. Hoyt 39 



4. Phoronis architecta: Its life history, anatomy, and breeding habits, by William Keith Brooks and Rheix- 



art Parker Cowles 71 



5. The affinities of the pelagic tunicates, No. 1: On a new Pyrosoma, by William Keith Brooks 149 



6. Commelinacese. Morphological and anatomical studies of the vegetative organs of some North and Central 



American species, by Theodore Holm 157 



7. Tables of minor planets discovered by James C. Watson, Part 1: Tables of (93) Mini rva, (101) Helena, (103 



Bern, (105) Artemis, (115) Thyra, (119) Althaea, (128) Nemesis, (133) Cyrene, (139) J a, (161) Atlior, 



(174) Phaedra, and (179) Klytaemnestra, by Armix O. Leuschnek 193 



in 



