Geology and Mineralogy. 567 



tree once established can survive, while in its prime, changes which 

 would disastrously affect very young or feeble trees. There are, 

 of course, other factors such as shading in youth, which can only 

 be eliminated by a method of averages, but it is seen that there 

 is here a priceless record, as yet only partly surveyed. But year 

 by year decay is making it more illegible. 



As climate varies in the same direction in similar climatic belts 

 throughout the world, but in opposite direction in belts of oppo- 

 site character, the record derived from California is of very 

 specific value for the understanding of the historic record of the 

 eastern hemisphere ; and further for the understanding of that 

 stratigraphic record of the geologic past which is the parent of 

 the human present. j. b. 



2. Connecticut Geological and Natural History Survey. 

 Volume IV, Bulletins 16-21, 1910-1913. 1914.— Volume IV of 

 the Connecticut Survey publications includes the following bulle- 

 tins previously issued in separate form : 



Bulletin 16, Guide to the Insects of Connecticut ; prepared 

 under the direction of W. E. Britton. Part I. General introduc- 

 tion by W. E. Britton. Part II. The Euplexoptera and Orthop- 

 tera of Connecticut, by B. H. Walden. Pp. 1-31, pis. I-XI, text- 

 figures 66. 



Bulletin 17, Fourth Biennial Report of the Commissioners of 

 the State Geological and Natural History Survey of Connecticut, 

 1909-10. 



Bulletin 18, Triassic Fishes of Connecticut, by C. R. Eastman. 

 Pp. 1-11, pis. I-XI, text-figures 8. 



Bulletin 19, Echinoderms of Connecticut, by W. R. Coe. Pp. 

 1-147, pis. I-XXXII, text-figures 29. 



Bulletin 20, The Birds of Connecticut, by John H. Sage and 

 Louis B. Bishop, assisted by Walter P. Bliss. Pp. 1-370. 



Bulletin 21, Fifth Biennial Report of the Commissioners of the 

 State Geological and Natural History Survey of Connecticut, 

 1911-1912. 



3. The recent Eruptions of Lassen Peak. — The September 

 number of the Bulletin of the Seismological Society opens with 

 an article by J. S. Dtller on the recent eruptions of Lassen Peak 

 in California, about which frequent reports have appeared in the 

 public press. As has been generally appreciated, the violence of 

 these eruptions has been a surprise not only locally, but to the 

 geologists who had worked in the Cascade Range. During the 

 period from May 30th to August 23d, 1914, thirty-two eruptions 

 art* included in the list given, of which one-half had an interval 

 of less than a day between them. The most violent eruption 

 took place on July 18th, when ashes, steam, etc. rose to a height 

 of lioo feet. An interval of twenty-three days followed before 

 another outbreak took place and this was of minor character. 

 The paper is accompanied by several plates giving striking views 

 of the eruption of June 14th, at successive intervals of five 

 minutes each, from 9.45 to 10 a. m. 



