488 OBIGINAL ARTICLES. 



a clubbed adunque state of the finger nails, and in Morbus Addisoni 

 betwixt disorganized supra-renal capsules and pigmentary skin dis- 

 colouration. *" Unable to rationalize, we class such phenomena as these 

 under the wide head of " Correlations of Growth." The very vague- 

 ness of the phrase prevents us from even momentarily deluding our- 

 selves with the idea that it amounts to an explanation, and to more 

 therefore than an expression, of facts. It cannot be accused of striv- 

 ing to conceal the flimsiness of its thought by a magnificent display 

 of archaic words, as certain exchequers would fain conceal their 

 bankruptcy from the world by a copious issue of paper money. Herein 

 lies its great merit. 



On a future occasion I shall consider the nature of the Hybernat- 

 ing glands, if so they may be called, of certain hybernating and non- 

 hybernating Insectivora and Chiroptera, and the possibility of classing 

 them as growths tautogeneous with the highly developed mesenteric 

 and cervical lymphatic glands found in many of those creatures. 



And, before concluding, I would mention yet another class of 

 structures, the existence of which admits of being rationalized upon 

 yet another principle. These structures, fixed and settled in the 

 adult organism, speak of a time when the sex was as yet unfixed and 

 unsettled in the developing embryo, and accessory organs of either 

 kind were, if so we may say, prepared so as to be in readiness to 

 meet either event. The mammary glands, the "Weberian organ, and 

 the cysts of Morgagni of the adult male, the round ligament and the 

 canals of Nuck and of Grartner of the adult female economy, may 

 have the history of their existence thus read. 



As more and more vera causes assert their existence and vindicate 

 their rights, the ancient realm of Archetypal Ideas wdll suffer more 

 and more serious curtailment* But, like other foiling empires, it too 

 will find its advocates to speak of it as being an " essentially conser- 

 vative pow T er ;" though after short campaigns it has, once and again 

 had to resign some of the fairest provinces in the world of thought, 

 its existence will still be said to be necessary for the " preservation 

 of the due balance of power" amongst rival biological principles. 



Let us hope that in the interludes of Ehetoric the Logic of Tacts 

 may find a moment to make itself heard. It will teach men mun- 

 dum quasrere non in onicrocosmo suo sed in mundo major e, to hold of 

 Nature that her ways are not as our ways, nor her thoughts as our 

 thouo-hts. The notion of type may help man's weakness, but it by 

 no means therefore follows that it regulates Nature's operations ; it 

 may enable us to colligate phenomena, but it may no more for that 

 be the cause of their evolution than the mule's panniers which carry 

 home the grapes are, by virtue of this their function, the cause of the 

 growth of the vine. 



* Even in Mr. Herbert Spencer's " First Principles," we find at page 22, the 

 following sentence. " In Biology we are beginning to progress through a fusion of 

 the Doctrine of Types with the doctrine of adaptations," and Mr. Darwin, in the last 

 page bat one to which we have referred in his writings, speaks of " Homology 

 coming into play" as a really efficient physical agent. 



