Comparative Zoölogy (Harvard), 13,000; Illinois Industrial University, 10,000; School of Mines, New York, 7,000; Sheffield Scientific School, 5,000. _Historical societies_ have been much more actively employed in collecting than the table we have given indicates. Since the adoption of the Constitution in 1789 no less than one hundred and sixty societies have been formed, and Dr. Homes of the New York State Library reports their collections to aggregate more than 482,000 volumes and 568,000 pamphlets. The number of MSS. is 88,771, besides 1,361 bound volumes of them. The largest accumulations are: _Volumes._ _Pamphlets._ _MSS._ Am. Antiq. Soc., Worcester 60,497 New York Historical 60,000 12,000 15,000 Wisconsin Historical 33,347 31,653 300 Long Island Historical 26,000 25,000 Massachusetts Historical 23,000 45,000 1,000 v. Congregational Library, Boston 22,895 95,000 550 Connecticut Historical 16,000 20,000 Amer. Philosoph., Philadelphia 20,000 15,000 100 v. German Society, Philadelphia 16,000 Pennsylvania Historical 16,000 30,000 25,000 It is among these societies that we find the largest average of any class, excepting the Government. Historical libraries contain about 8,400 bound volumes, 7,000 pamphlets, and 1,000 MSS. to each collection. In spite of this the public collections are often surpassed in completeness in special branches by private ones. In this country a public institution can rarely compete successfully with an eager and determined private buyer. _Government_ libraries include others than those for the use of officials, as the following list shows: _Libraries._ _Volumes._ 1. Government 35 695,633 2. State and Territorial 47 834,219 3. Garrison 40 32,745 The official libraries are of several kinds, and as many of them are of prime importance, we may be permitted to specify them more minutely than those of any other class: _Volumes._