New Publicatimis. 215 



unless the solutions be so concentrated as to injure the texture 

 of the paper. The author offers this composition as a writing- 

 ink, to be used on paper, for the drawing out of bills, deeds, 

 wills, or wherever it is important to prevent the alteration of 

 sums or signatures, as well as for handing down to posterity 

 public records, in a less perishable material than common ink. 

 He concluded his paper by stating, that should it be found 

 to present an obstacle to the commission of crime — should it, 

 even in a single instance, prevent the perpetration of an of- 

 fence so injurious to society as the falsification of a public or 

 a private document, the author will rejoice in the publication 

 of his discovery, and consider that his labour has not been in 

 vain. 



NEW PUBLICATIONS. 



1. Gaea Norvegica. Conducted by Professor Keilhau. Part 1st. 4to, 

 with Geological Map and Plates. Christiania, 1838. Dalil. (/». 

 German). 



The writings of Von Buch, Hausmann,JNaumann, Esmark, 

 Brongniart, Bedemar, and other travellers, and those of Profes- 

 sor Keilhau himself, have already put us in possession of a 

 large mass of geological knowledge respecting Norway. A de- 

 tailed and systematic geological description of that interesting 

 country is, however, still a desideratum ; and we hail with great 

 gratification the long expected appearance of the first part of 

 a publication which will furnish the materials for such a work. 

 The *' Gaea Norvegica,'" which may in some respects be com- 

 pared to Dufresnoy and Beaumonfs " Memoires pour servir a 

 une description gcologique de la France ^^ is to appear from time 

 to time, is to consist of memoirs by various individuals, and is 

 to be conducted by Professor Keilhau, who will himself con- 

 tribute by much the largest portion of the matter. That in- 

 defatigable and able geologist has examined almost every por- 

 tion of his native country, has traversed it repeatedly in all di- 

 rections, and has digested and prepared for pubhcation nearly 

 the whole of his observations. It is to be regretted that the 

 future numbers of the Gaea cannot be expected to follow the 



