CONTENTS. 
PAGE 
Proceedings: December 83,1888: .. o0..00« supe estes o's <a aelhne mee eee 29 
Donations:to ‘the Library =... 00. 05s.35cnes «sauce seve ste ee ee 29 
Silicified Woods from California. 3.5%... >. 2.5. oe ew ose akon 29 
Cretaceous Clays of Staten Island. /.)...0.....cse0ecveee suede em 31 
Forestry in the State of New York ;—need of special training for 
foresters ;—successful methods pursued in Europe. By H. 
NICHOLAS JARCHOW >... v5 4.c5.s0c8 esr sae 2 hehe isc ane ee eiveres 31 
Discussion: : - fet s spo. dowd oa iets aah Seen Goo eee 36 
Proceedings: December 10, 1888:¢.... 2.45. o-s neck cst ene sees Srey! 
A New Species of Spermophile from California (S. Beldingi). 
By C, Hart Mareiam (Citlé) 5... ico vss one's ©) oe Sale a ee 41 
A Preliminary Monograph of the North American Species of Tro- 
gophiczus.. By THOMAS Iz -Casny (Hille) 2. (5.2 aes oe eae 41 
The Pavements of the Great Cities of Europe, with a review of 
the best methods and materials for the City of New York. By 
JOS. NEWBERRY (oie sc ticna oe tle een oe ene es Some en 41 
Aragonite Breccia from Southern Mexico .........-....0. seece- 44 
Proceedings: January). %, 1899) 25 826.55 fetaas « cele Ap teatvclocnlele P 45 
Copper. Minérals from Arizona 25.7.3. 0.. sees sss a ss tee eee eee 45 
Memorial of the late Mr. B. B. Chamberlin.............. .-esee- 46 
Comparison of the Rocks of Philadelphia and New York. By 
THEODORE AD RAND: cave £5. oie Sac 'a's Meee Seale vs Ge vee aa 47 
Discussion 72) 33e-t cr pesos or cee ae alles fe ee ae ee 51 
The Lithology of Manhattan Island. By J.J. FRIEDRICH 3%... nen 53 
Proposed suggestion to the City authorities.............. . .-... 55 
Proceedings: January: 14,1889. 02 . .vcawen ee ep oehisas . tee en 56 
Sperry lite, anew mirneral..2), paseetcew + ss oe Seca eae at ee 56 
The Mineralogy of the French Creek Mines, Pennsylvania. By 
JOHN AUYERMAN), 22 562 ats cde oferta ok ie os ae kets eee 56 
Proceedings:-January.21,:1889:0 8 van lge bce os eieale we crap ee os een ae 59 
Programme of the Public Lecture-Course.......--...++-2eseee oe 59 
Plants collected in Arizona by Dr. E. A. Mearns. List, with 
notes and descriptions of New Species. By N. L. BRITTON..... 60 
General Floral Characters of the region where Dr. Mearns’ collec- 
tions were made. By HENRY H. RUSBY.......... .+-+ +> Heerths 
DISCUSSION! wie «ciere Coie soa ey te eels ates tale Crud ere fis Steet 81 
Proceedings: January 28, 1889........- cece eec eee eect eee eeeeeeeeee 82 
Volcanoes, their Distribution and Phenomena, with special refer- 
ence to the great eruption of Krakatoa. 
Public Lecture, by Prof. DARWIN G, EATON. ......000++seeeeeees 82 
