Mr. Griffin's System of Crystallography. 303 



may confidently predict the work before us will not be exempt. 

 "The different sj^stems," it proceeds, "hitherto published have 

 failed to satisfy the wants of the puhlic." We do not know to what 

 Tpuhlic Mr. Griffin refers. Surely not to those by whom the tens of 

 thousands of copies of ' Nicholas Nickelby ' and ' Jack Sheppard ' 

 are eagerly purchased, or the novels of fashionable life as eagerly 

 perused ; and if not to these, what reading public is to be found, 

 and more especially where the cultivators of science, whose wants 

 the existing works on Crj'stallography have failed to satisfy ? 



The different systems to which our author alludes are, he con- 

 tinues, "either too difficult to learn, or, when learnt, too troublesome 

 for service. Hence," he says, " crystallography is little studied by 

 chemists or mineralogists ; and the consequence is, that for want of 

 a language in lohich observations can be recorded, the study of crystal- 

 lization is also shunned." Our mineralogical readers must know that 

 this statement is unfounded ; and we can only account for its having 

 dropped from the pen of Mr. Griffin, by supposing the preface to 

 have been written after the work was finished, and the author to 

 have entirely forgotten not only a work to which he has so frequently 

 referred, but even the name of William Phillips. 



The preface proceeds to state that " the present publication is an 

 attempt to show the way, not merely how to describe a crystal, but 

 how to do it easily." 



The following are examples of the simple and easy method of de- 

 scription employed by the author : 

 54. TuRNERiTE. Pictite. Cleavage=m, T. 

 5. 5. t, m gSy t, M-jS-T, mf t. iP^M Z'-'n, ip-iu Zn^ ^p- m Zs, 

 ^p— My^j T Zn^e ZnV, 5 (^p— m^t) Zne^Znw^, 



2p,m^oT Zs^e ZsV, |p + mft Zse= Zsw^, P842. 



5. 5. T, M^T, M^T, mft. IP^M Z%, J-p-m Zs, 



3p— ffljjt Zne Znw, p— m,t Zse Zsw, Ly822. 



Partll. p. 91. 

 Anorthite. 



5. 3. T, iM^Tnw,iM|Tne.^p,m,t,Znw°-, ^P,M,T, Z^ne. 



ip^myt, Zn'^e, ^p^myt,Zne"-,^p^myt, Zs^e^ip^^m^t^ Zs'e, 



^p^mytj Zs-w-, R33o,3i_ 



5. 3. T, ^M^T nw, ^M^T ne. ip,m,t, Znw"-, iP,M,T, Z%e, 



3 (ip^myt, Zne), 4 {\T^ja^t^ Zse), 2 Qp^m^t, Zsw), RS^'-", 



5. 5. T, ^M^T nw,iM|T ne. ^p.m^t, Znw^ iP,M,T^ Z«ne, 



|PxmytjZn-e,:^p^mj,t^Zne-, R3-28 21)^ 



5. 5. T, ^M^T n'w, ^m-J-t nw'^ J ff n'e, ^m + t ne^ 



-jp,m,t, Znw2, :j;P,M,T, Z=ne, \^^m,t, Zne'^ 



4(iPxm,t, Zse), 3 (:l:P,m,t, Zsw), R334. 



Part II. p. 93. 



