96 
shown to be higher than the Potomac of Virginia, and to have 
strong affinities with the Dakota group, the Atam and Patoot 
“beds of Greenland, the Cretaceous clays of Aachen, Germany, 
and the upper Cretaceous rocks of Bohemia. The geological po- 
sition and the abundant angiospermous flora furnish a complete 
refutation of the contention that the Amboy Clays can belong to 
the Jurassic. 
The task of editing a posthumous work is always a delicate 
one, since the editor is in constant fear of not correctly interpret- 
ing the author. In this respect Mr. Hollick seems to have been 
very judicious, and has made only such changes in the original 
Manuscript as were necessary on account of discoveries made or 
publications issued subsequent to the time when the author ceased 
active work. These changes are presented in the form of foot- 
notes over the editor’s initials ; the work, therefore, is essentially 
Dr. Newberry’s. 
The plates, in point of mechanical finish, are unquestionably 
the best that have thus far been made of this class of objects by 
the Geological Survey. The printing is also of good quality, but 
it is unfortunate that the book should be marred by an incorrect 
date of issue. It appears from the letter of transmittal that it was 
submitted in March, 1894. It bears on the title page the date of 
1895, whereas it was only issued in the last days of 1896. 
Spermatozoids in Phanerogams. The leading articles in recent 
numbers* of the Botanisches Centralblatt are contributed by two 
Japanese botanists, Prof. S. Ikeno, of the University at Tokio, and 
Dr. S. Hirase, of the same institution. In these two rather brief — 
papers is announced a discovery of great interest to the botanical 
world—that of spermatozoids in Ginko biloba and Cycas revoluta. 
If confirmed, this will prove one of the most significant additions 
to the comparative morphology of the higher plants that has been 
made since the time of Hofmeister. 
While more details are promised in papers that are to follow, — 
enough is given in these preliminary contributions to inspire a good 
degree of confidence. In Ginko biloba, according to Dr. Hirase, 4 
*Botanisches Centralblatt, 69: 1-3; 33-35. 1897. 
