210 



J. W. Judd — On Volcanos. 



position and relations of its 

 crater, and the depth of the 

 sea around it, Mr. Eobert 

 Mallet has lately cast doubt 

 on the accuracy of the state- 

 ments of previous obser- 

 vers, and has published 

 a series of "hypsometric 

 measurements," which 

 were made by him in 1864, 

 " by means of a single 

 aneroid," and of soundings 

 made in positions which 

 were " guessed " by him- 

 self and a friend. On the 

 basis of these corrected 

 measurements, Mr. Mallet 

 has put forward a very 

 novel and startling theory, 

 namely, — that Stromboli is 

 not an ordinary volcano, as 

 every previous observer 

 had supposed, but a singu- 

 lar combination of a geyser 

 and a volcano ! 



It is certainly to be re- 

 gretted, not only on Mr. 

 Mallet's own account, but 

 for the sake of the credit of 

 British science, that, during 

 the ten years which elapsed 

 between his obtaining these 

 observations and his publi- 

 cation of the extraordinary 

 theory which he has found- 

 ed upon them, no attempt 

 seems to have been made 

 by this author, either to 

 verify or check his mea- 

 surements, although the 

 most ample means existed, 

 in numerous official publi- 

 cations, for so doing. 



In order to give a dis- 

 tinct idea of the true rela- 

 tions of the different parts 

 of the volcano, I have 

 constructed a section (see 

 Fig. 13) on the natural 

 scale, passing from N.W. 



