This law assumes that one can influence something based on its relationship or resemblance to another thing. It's the magical law that describes Sympathetic Magic and also influences many other forms of magical workings. It can be further broken down into two counterparts: The Law of Contagion, and The Law of Similarity. 

Like the magical Law of Contagion, The Law of Similarity governs Sympathetic Magic. This law states that a Magician can produce any effect by simply imitating it. In other words, having a physical or mental representation of a thing facilitates the ability to have control or influence over said thing. 
This law supports magical workings like voodoo dolls, poppets, figure candles, and all other spells that involve assigning representation to an object to effect the thing/person it represents.

First introduced by George James Frazer in The Golden Bough, the law of contagion states that once two objects/people have been in contact, a magical link persists unless/until a magical act (such as cleansing, consecration, exorcism, cord cutting, or other act of banishing) breaks the non-material bond. This law is one of the two fundamental laws that Sympathetic magic is founded upon. 
This is a powerful law (with parallels in Quantum Physics according to Isaac Bonewits) that holds true for non-magic believers (read: muggles) as well. For example, a person who does not believe in magic or believe themselves to be 'superstitious' might still have reservations about living in a house where murders took place, or owning an item previously belonging to a person deemed to be 'evil'. 

​ertility spells seem tricky to me. If a fertility spell is performed then it's highly likely that whoever the spell was done for is also actively trying to conceive in other ways as well. (These aren't the only spells like this, but just one that I think about a lot). So if / when conception is achieved, was it the spell which caused it? I mean obviously there's really no way of knowing, but the wonder I guess is what makes magic so... magical. 

​Allium Sativum is a species in the onion genus, Alium. Close relatives include the onion, shallot, leek, chive and rakkyo. Garlic has a history of human use of over 7,000 years. It's native to central Asia, but was known to the ancient Egyptians. 
* Single clove garlic (pearl garlic) originated in the Yunnan Province of China. 
*The use of garlic in China dates back to 2000 BC. And it was consumed by Ancient Greek and Roman soldiers, sailors, and rural class. According to Pliny the Elder is was also consumed by the African peasantry.
*Greeks placed garlic on piles of stones at crossroads as a supper for Hekate, and it was taken by Egyptians to invoke deities at the taking of oaths.
*Garlic was used during World War I and II as an antiseptic to prevent Gangrene.  
*In Iranian countries which celebrate Nowruy (Persian Calendar New Year) garlic is one of the items in a seven-seen table (traditional new year display). 
*In Islam it is frowned upon to eat raw garlic before going to mosque. 
*In Hinduism and Jainism garlic is thought to stimulate and warm the body. 
*In Buddhist traditions garlic (and the other fine pungent spices) is understood to stimulate sexual and aggressive dreams