Decejebee 27, 1895.] 



SCIENCE. 



903 



very beautiful and brought out some interesting 

 points with reference to time of exposure. 



The third paper of the evening was by Prof. 

 J. K. Kees, on ' Drawings made by Percival 

 Lowell of the Markings on the Planet Mars.' 

 These drawings corroborate to a very remark- 

 able degree the observations of Schiaparelli. 



and indicating the manner in which poisoning 

 is likely to occur. The classification of the 

 poisoning agents is indicated by the appended 

 table. The paper will be printed in full in 

 The Alumni Journal of the College of Pharmacy. 

 H. H. RUSBY, 



Recording Secretary. 



TABLE EXHIBITING THE POISONOUS PLANTS OF THE VICINITY OF NEW YOEK CITY. 



FLOWERS. FEUITS AND SEEDS. 



Convallaria. The Actseas. 

 Cicuta. 

 Coaium. 

 Solanum tub. 

 dul. 

 Datura. 

 Taxus. 

 Elcinus. 



Aesculus Pavia. 

 Chenopodium amb. 

 Euphorbia. 

 Hyoscyamus. 

 Atropa. 



Sambucus. Sambucus. 

 Kalmia. Sinapis. 



Pieris. Juniperus. 



The drawings provoked an animated discussion 

 in which Profs. Mayer, Eees, Post, Jacoby and 

 Hallock took part. The prevailing opinion 

 seemed to be that, although Mr. Lowell de- 

 served much credit for great application and 

 labor, we must await further corroboration be- 

 fore accepting his rather extreme theories. 

 "William Hallock, 

 Secretary of Section. 



THE TOEEEY BOTANICAL CLUB. 



At the meeting on Wednesday evening, No- 

 vember 27, a lecture was delivered by the under- 

 signed on The Poisonous Plants of the Vicinity of 

 Neiv York City, illustrated by colored lantern 

 slides. The subject was treated with special 

 reference to the presentation of evidence prov- 

 ing the poisonous nature of the plants named 



Podophyllum. 

 Ailanthus. 

 Aesculus Hip. 

 Prunus. 



GEOLOGICAL CONFEEENCE OF HAEVAED TJNI- 

 VEESITY, DECEMBEE 3, 1895. 



Some Features of Joints. By J. B. WOOD- 

 WOETH. For several years past the author has 

 been gathering material illustrating the intimate 

 structure of joint-planes. Observations based 

 upon the closely-set joint-planes of the argillites 

 of the Mystic river quarries, near Cambridge, 

 show that there is a type of joint-plane exhibit- 

 ing on its surface fine divergent lines compa- 

 rable to the ' percussion rays ' of flint chips, and 

 indicating the direction of propagation of the 

 splitting movement which resulted in the forma- 

 tion of the joint. These lines were in the case 

 of the joints, called 'feather fracture.' These 

 apparent rays are simply cross fractures between 

 thin laminse of rocks formed by minute planes 

 of fracture, and some of the typical joint-planes 



