328 Lichenes. — Floristik etc. 



durch seine Seltenheit bemerkenswerte Calicium corynellum (Ach.). 



Simon (Dresden). 



Christensen, C, Natur forskeren Peter Forsskäl, hans 

 Rejse til Aegypten og Arabien 1761—63 og hans bota- 

 niske Arbejder og Samlinger. Med 40 hidtil utrykte 

 Breve og Dokimenter og et Portraet. [The naturalist 

 Peter Forsskäl, his journey to Egypt and Arabia 

 1761 — 63 and his botanical works and collections. With 

 40 letters and documents hitherto unpublished and a 

 Portrait]. (Köbenhavn, H. Hagerup. 1918. 172 pp. 8°. Price 8 Kr.) 



Peter Forsskäl was a Swede, a pupil ofLinnaeus, who 

 was engaged by the Danish Government to partake as naturalist in 

 the expedition to Arabia felix 1761. He died in Jerim 1763. 

 The first part of the present book deals with the expedition and its 

 history and is based principally on hitherto unknown letters in the 

 Danish State Archives, of which 40 are printed in an appendix; 

 most of them are written in German, a few in French. It is shown 

 that F. was the most important member of the expedition-staff, of 

 which Carsten Niebuhr alone returned to Copenhagen. In a 

 special chapter are dealt with F.' qualities as a botanist, and the 

 author considers him one of the most promising of the pupils of 

 Linnaeus. The second part deals with F.' botanical Mss. and 

 Collections; the former were edited by Niebuhr (Flora aegyp- 

 tiaco-arabica), and the plant-specimens were critically determined 

 by M. Vahl. Later on they were badly treaten and nearly forgot- 

 ten, but they are new collected together into a separate Herba- 

 rium Forsskälei, which contains about 1300 specimens, between 

 which are the majority of the original types of the species described 

 by F. The herbarium is in the Botanical Museum of the Univer- 

 sity of Copenhagen. Carl Christensen. 



Griggs, R. F., Scientific results of the Katmai expedi- 

 tions of the National Geographie Society. LV. The 

 character of the eruption as indicated by its effects 

 on nearby Vegetation. (Ohio Journ. Sei. XIX. ;p. 173 — 209. 

 With map and 18 photographs. Jan. 1919.) 



The area around the volcano is divided into six zones, num- 

 bered towards the volcano. In the first zone some 300 miles from 

 the volcano plants were injured by rains containing sulphuricacid. 

 In the second zone, comprising over 7000 Square miles, ash feil so 

 dense as to destroy the smaller plants. In the third zone, 25 miles 

 from the volcano the forests were destroyed over 1500 Square miles 

 of territory by blasts from the volcano. In the fourth zone the ash- 

 fall was so heavy as to obliterate practically all herbaeeous plants. 

 In the fifth zone hot mud flows destroyed all Vegetation and the 

 sixth zone of about 39 Square miles was probably swept by fires 

 of great intensity which destroyed all life. W. B. McDougall. 



Harper, R. M M A sketch of the forest geography of New 

 Jersey. (Bull. Geogr. Soc. Philadelphia. XVI. p. 107—125. With 

 five illustrations and one map. Oct. 1918.) 



The State is divided into nine regions and each region is de- 



