iM €ERARDI REGNERI FOCKENS 



« scilicet duobiis saltemscrupulisprinnis major , quam D. Wrighli observationes nccti« 

 « ralae eam exhibebanl. Unde forsan factum est, quod D. Ilook sunpicatus sit aliquid 

 « eiToris in suis observalionibus , aliique eas minoiis aeslimaverint, quam meruerint. " 



Praelerea eliam Whistonus memorat Hookium in praeicctionibus antronomicis [*), 



Ergo hie parallaxin quaesivit , derideravit , provocavit , sed , licet nullam invenisaet, 

 variationem quandam erronee observatam bene eiiplicuit. 



Non Video nutem , quomodo von Zach dicat (f ). 



« Hook, der im Jahwe 1660 mit einem feslgemauerten Fernrohr von 38 Fuss meArere 

 « Ja/iiä y Draconis fleissig beobachtete, glaubte in einer Differenz der Zenith-Distanzen 

 «eine Parallaxe wahrzunehmen; alkin man fand spiiterhia , dass diese Bestimmungea 

 f nicht die erforderliche Zuverlässigkeit hätten. " 



Sed Judicium potius audiamus Bradlei (*'): 



« As to Ihe observations of Dr. Hook, I must own to you , thal before Mr. Moly- 

 «neux's instrument was ereoted, I had no small opinion of Iheir correctness ; the 

 « lenglh of his telescope and the care he prelends to have taken in making them 

 « exact , haviug been slrong inducements with me to think them so. And since I have 

 « heen convinced bolh from Mr. Molyneux's observations and my own, that the 

 « Doctor's are rcally very far from being either exact or agreeable to the phaenomena ; 

 I am greally ot a loss how to account for it. I caimot well conceive that an instru- 

 « ment of the length of 36 feet, constructed in the manner he describes bis, could 

 « bave been liable to an error of near 30" (which was doubtless the case) if rectified 

 « with so much care as he represents, " 



et Judicium Brinkl ei ( ft ) • 



« Theresults of the atterapls of Hooke and Flamslead are remarkable ; Ihe former 

 « reasoned justly on inaccurate observations, and Ihe latter wrong on exact ones; and 

 « both imagined they had discovered a parallax. Hooke, who erected at Chelsea a 

 « fixed telescope , 36 feet long , for observing y Draconis , found a change of place 

 « agreeing with a considerable parallax. The great mechanical skill of Dr. Hooke, 

 « the lenglh of his tekscope « and the precautions he took , seemed to leave no 

 « doubt. ". 



$4. 



(•) Delambre, Histoire de VÄstronomie au XVIII Such. p. 5i. 



(**) Von Zach, L.. L. 1809. p. 4o. 



(t) Phil, Irans. 1738. LIU, p, 6fii, (tt) PUt, Trans. l8»8, p. 3««, 



