GENERAL ABSTRACT OF CONTENTS OF REPORT. 



PRELIMINARY ADDRESS. 



I. Granites, including Sienite, Gneiss or Gneissoid and Sienitic Rocks; 



their Geological position and Geographical distribution. 



n. Marbles or Metamorphic crystalline limestones, their Geological position 

 and Geographical distribution. 



III. Limestones not Metamorphic, compact or sub-crystalline ; their Geologi- 



cal position and Geographical distribution. 



IV. Sandstones or freestones, and their varieties; their Geological position 



and Geographical distribution within the State of New York. 



V. On the selection of Building Stones, and the cause of their decay. 



VI. General composition and comparative durability of Building Stones. 



VII. Modes of determining the character and strength of Building Stones. 



Vin. Causes affecting the durability of Building Stones, which are inherent 

 in the Stone itself. 



IX. Causes affecting the durability of a Stone, which are accidental, or due 



to artificial or extraneous conditions. 



X. Results of trials of the strength of various Stones with tables of com- 



paiison for other Stones. Incomplete. 



XI. Catalogue of the principal Stones in Collection, which have been sub- 



mitted to the Commissioners for their inspection, or collected during 

 the examination. 



■ [Assem. Doc. No. 104. J 29 



